Development of a technology of compaction of increased-density parts using gas drainage methods. IV. Compaction of powder materials without plasticizer

A new compaction method uses a porous female die made of powdered materials without plasticizer. Powders alloyed with carbon, nickel, chromium, molybdenum, and microtalc were used to produce the porous die. The powder was compacted by a special device, in which the operating surface of the matrix was lubricated through the open pores of the powdered material. Compaction of materials into a porous die ensures highly efficient drainage of gases from the press mold. As a result the density of iron-based compacts increases to 7.4–7.7 g/cm³ and in regard to mechanical properties the sintered materials can compete with those obtained by hot forging.